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Your margins shouldnt face each other. Put a mark on the ring that will be the top of the mould when its in the cradle. Face the margins towards the trailing edge of the arm and slightly upward toward the top of the mould. Narrow your sprues where they connect so you dont get porosity. No offense but this is where our industry is going.. take the time to hand wax a crown and you will really care about how well it casts. Casting is not CAD/CAM, its what separates the men from the boys and it takes a while to get it figured out, hell im still learning too.